EVIDENCES OP FORMER ICE INVASION. 259 



places. The same is true of till deposits. The}*' were never found on 

 high, steep hillsides, but were seen at several places in the lower parts of 

 the peninsula, as well as in the lower valleys of moderate slope. A 

 rather extensive boulder clay bed exists on the northwestern side of 

 Wilcox Head, where it has evidently been brought from the highlands 

 and accumulated on the northwestern or lee side of the hill. Near the 

 top of Wilcox Head, also on the lee side of the ridge, upon a mod- 

 erately steep upland, a bed of boulder-clay was found at an elevation of 

 1,200 feet above the sea. 



Having determined the nature of the bed rock exposed, we were easily 

 able to trace the former glaciation by means of the distinctly unusual 

 transported pebbles and boulders of red porphyritic granite, slate, and 

 quartz ite. 



The nunatak mount Schurman rises above the surface of the ice of 

 Cornell glacier 460 feet on the eastern side, and on the western 1,000 feet 

 above the surface of the ice. Upon the very top of this mountain trans- 

 ported pebbles were found, and one slate pebble with perfectly preserved 

 glacial striae on the under side was brought away. 



Mount Hope, reaching 1,450 feet above the sea and 390 feet above the 

 base of the ice on the eastern side, has also been glaciated over its entire 

 area, but it has a broad, well rounded surface. 



The Devil's Thumb (as marked on the Danish and British Admiralty 

 maps, though incorrectly), rising 2,650 feet above the sea, at a distance 

 of about five miles from the ice, has transported blocks upon its crest. 

 A specimen of scratched slate was brought from here.* At numerous 

 high points on the peninsula transported fragments w r ere found, and all 

 proof that we could obtain pointed toward the conclusion that every bit 

 of land of this peninsula had been glaciated. 



On Wilcox Head, in addition to the boulder-clay bed at an elevation 

 of 1,200 feet, mentioned above, transported blocks of quartzite and red 

 granite were found at an elevation of 1,400 feet above the sea 25 miles to 

 the westward of the present ice margin. At the Duck islands, 8 or 10 

 miles from Wilcox Head, in addition to the bed of boulder-clay men- 

 tioned, numerous pebbles of quartz and red granite were .found, and it 

 was shown that the surface of this, the outermost land of this portion of 

 the Greenland coast, had also been glaciated. 



Amount of former Ice Invasion. 



This is proof that the ioo in this portion of the Greenland ice-sheet 

 reached at least 30 or 35 miles to the westward. That is as far as there 



* Obtained for me by Professor Gill and Mr Martin. 

 XXXVIII- Bull. Geol. Soc. Am., Vol. 8, 1896 



